PROBLEM TO BE SOLVED: To provide a continuous decontamination/sterilization device which has high decontamination/sterilization effect and high productivity when decontaminating and sterilizing the outer facing part of a package and conveying the package into the sterile working room, maintains reliability and safety of decontaminating and sterilizing effect high and can suppress the initial cost and maintenance cost of the device low, and a method.SOLUTION: The continuous decontamination/sterilization device has the decontamination chamber 120, sterilization chamber 130, the conveying means 20, 70 conveying an accommodated body. The decontamination chamber has a plurality of chambers 40 circulating the inside of the decontamination chamber along the conveying means, the circulation means 50 having the accommodation mechanism 53 accommodating the bottom face and lateral face facing parts of the accommodated body in the inside of the chamber while circulating the above chambers, the decontamination gas supplying means G supplying decontamination gas to the bottom face and lateral face facing parts of the accommodated body accommodated in the inside of the chambers, the sterilization chamber has the electron accelerator 60, 61 for irradiating an electron beam to the upper face facing part of the accommodating to body.
